About this TI4 Battle Calculator

Welcome to the most advanced Twilight Imperium 4th Edition Battle Calculator allowed by galactic law. Whether you are planning a desperate defense of Mecatol Rex or a surgical strike on a border system, accurate probabilities are your best weapon.

How to Use

• Select Mode: Choose Space Combat, Ground Invasion, or "Full Invasion" (simulating a landing).
• Enter Units: Input the fleet composition for both Attacker and Defender.
• Apply Upgrades: Check unit technologies (like Dreadnought II) or faction abilities.
• Analyze Results: Look beyond just "Win %". Check the "Resources Lost" metric to see if the battle is resource-efficient.

Advanced Features

Unlike basic calculators, this tool accounts for:

• Sustain Damage Logic: The simulation intelligently sustains damage on rigorous units like Dreadnoughts and War Suns to maximize firepower duration.
• Anti-Fighter Barrage: Destroyer AFB rolls are processed before main combat, stripping fighter screens effectively.
• Cost Efficiency: We calculate the TGP (Trade Good Value) of units lost, helping you decide if a pyrrhic victory is worth it.

Common Mistakes in TI4 Combat

Overvaluing Dreadnoughts against swarms: A single War Sun or Dreadnought fleet can undoubtedly be overwhelmed by a massive swarm of Fighters due to the sheer number of dice. Always screen your capital ships.

Forgetting PDS II: Planetary Defense Systems with Deep Space Cannon are often the difference between holding a system and losing it before the invasion even begins.

Frequently Asked Questions